Composition and temperature-dependent phase transition in miscible Mo1-xWxTe2 single crystals

被引：70

作者：

Lv, Yang-Yang ^{[1
,2
]}

Cao, Lin ^{[1
,2
]}

Li, Xiao ^{[1
,3
]}

Zhang, Bin-Bin ^{[1
,2
]}

Wang, Kang ^{[1
,3
]}

Pang, Bin ^{[1
,2
]}

Ma, Ligang ^{[1
,3
]}

Lin, Dajun ^{[1
,2
]}

Yao, Shu-Hua ^{[1
,2
]}

Zhou, Jian ^{[1
,2
]}

Chen, Y. B. ^{[1
,3
]}

Dong, Song-Tao ^{[4
]}

Liu, Wenchao ^{[1
,2
,5
,6
]}

Lu, Ming-Hui ^{[1
,2
]}

Chen, Yulin ^{[7
,8
,9
]}

Chen, Yan-Feng ^{[1
,2
,10
]}

机构：

[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[2] Nanjing Univ, Dept Mat Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China

[3] Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China

[4] Jiangsu Univ Sci & Technol, Inst Mat Sci & Engn, Zhenjiang 212003, Peoples R China

[5] Nanjing Tech Univ, IAM, Nanjing 211800, Jiangsu, Peoples R China

[6] Nanjing Tech Univ, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, Nanjing 211800, Jiangsu, Peoples R China

[7] Shanghai Tech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China

[8] Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China

[9] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[10] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China

来源：

SCIENTIFIC REPORTS | 2017年 / 7卷

基金：

中国国家自然科学基金;

关键词：

WEYL FERMION SEMIMETAL; MAGNETORESISTANCE; STATE; SUPERCONDUCTIVITY; RESISTIVITY; DISCOVERY; MOTE2;

D O I：

10.1038/srep44587

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Transition metal dichalcogenides (TMDs) WTe2 and MoTe2 with orthorhombic Td phase, being potential candidates as type-II Weyl semimetals, are attracted much attention recently. Here we synthesized a series of miscible Mo1-xWxTe2 single crystals by bromine vapor transport method. Composition-dependent X-ray diffraction and Raman spectroscopy, as well as composition and temperature-dependent resistivity prove that the tunable crystal structure (from hexagonal (2H), monoclinic (beta) to orthorhombic (Td) phase) can be realized by increasing W content in Mo1-xWxTe2. Simultaneously the electrical property gradually evolves from semiconductor to semimetal behavior. Temperature-dependent Raman spectroscopy proves that temperature also can induce the structural phase transition from beta to Td phase in Mo1-xWxTe2 crystals. Based on aforementioned characterizations, we map out the temperature and composition dependent phase diagram of Mo1-xWxTe2 system. In addition, a series of electrical parameters, such as carrier type, carrier concentration and mobility, have also been presented. This work offers a scheme to accurately control structural phase in Mo1-xWxTe2 system, which can be used to explore type-II Weyl semimetal, as well as temperature/composition controlled topological phase transition therein.

引用

页数：9

共 51 条

[21] Phonon anharmonicity in bulk Td-MoTe2 [J].

Joshi, Jaydeep ;

Stone, Iris R. ;

Beams, Ryan ;

Krylyuk, Sergiy ;

Kalish, Irina ;

Davydov, Albert V. ;

Vora, Patrick M. .

APPLIED PHYSICS LETTERS, 2016, 109 (03)

[22] Temperature dependent piezoreflectance study of Mo1-xWxSe2 layered crystals [J].

Ke, T. Y. ;

Hsu, H. P. ;

Wang, Y. P. ;

Huang, Y. S. .

JOURNAL OF APPLIED PHYSICS, 2015, 118 (21)

[23]

Keum DH, 2015, NAT PHYS, V11, P482, DOI [10.1038/nphys3314, 10.1038/NPHYS3314]

[24] Van der Waals density functionals applied to solids [J].

Klimes, Jiri ;

Bowler, David R. ;

Michaelides, Angelos .

PHYSICAL REVIEW B, 2011, 83 (19)

[25] Chemical accuracy for the van der Waals density functional [J].

Klimes, Jiri ;

Bowler, David R. ;

Michaelides, Angelos .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2010, 22 (02)

[26] Raman scattering investigation of large positive magnetoresistance material WTe2 [J].

Kong, W-D. ;

Wu, S-F. ;

Richard, P. ;

Lian, C-S. ;

Wang, J-T. ;

Yang, C-L. ;

Shi, Y-G. ;

Ding, H. .

APPLIED PHYSICS LETTERS, 2015, 106 (08)

[27] Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set [J].

Kresse, G ;

Furthmuller, J .

PHYSICAL REVIEW B, 1996, 54 (16) :11169-11186

[28]

Lv BQ, 2015, NAT PHYS, V11, P724, DOI [10.1038/NPHYS3426, 10.1038/nphys3426]

[29]

Lv Y.-Y., 2016, ARXIV160805216

[30] Dramatically decreased magnetoresistance in non-stoichiometric WTe2 crystals [J].

Lv, Yang-Yang ;

Zhang, Bin-Bin ;

Li, Xiao ;

Pang, Bin ;

Zhang, Fan ;

Lin, Da-Jun ;

Zhou, Jian ;

Yao, Shu-Hua ;

Chen, Y. B. ;

Zhang, Shan-Tao ;

Lu, Minghui ;

Liu, Zhongkai ;

Chen, Yulin ;

Chen, Yan-Feng .

SCIENTIFIC REPORTS, 2016, 6

← 1 2 3 4 5 6 →